Magazine grinder



C. A. WATEROUS May 5, 1936. Y

MAGAZINE GRINDER Filed June 29, 1955 2 Sheets-Sheet l Mly 5, E. alf

.c. A. WATEROUS 2,039,572

MAGAZINE GRINDER Filed June 29, 1933 2 Sheets-Sheet 2 Patented May 5,1936 PATENT OFFICE MAGAZINE -GRINDER Charles Alexander Waterous,Brantford, Ontario, Canada Application June 29, 1933, Serial No. 678,296

10 Claims.

This invention relates to magazine grinder construction. In magazinegrinders of the type where the logs are fed to a grinder pocket, undertheir own pressure, considerable difliculty is experienced in that thelogs often tend to become jammed and packed in the magazine so that itis very difficult to operate the apparatus smoothly to load charges oflogs into the grinding pocket.

An object of the present invention, therefore, is to provide anarrangement for releasing the pressure between the logs as they approachthe pocket of the grinder so that they may freely drop into the pocketand the smooth operation of the grinder in respect to feeding ispositively assured.

A further object of the invention is to provide an arrangementpermitting flexibility in at least one wall of the magazine which willbe periodically available in the loading of the logs into the pocket.

A still further object of the invention is to provide means of thischaracter which may be operated automatically.

A still further object of the invention is to provide a means of thischaracter which is of an extremely simple nature.

With these and other objects in view, the invention will be apparentfrom the following speciiication in conjunction with the accompanyingdrawings which form part of the same.

In the drawings:-

Figure 1 is a sectional side elevation of a pocket grinder tted with onepractical form of means for providing flexibility in the wallconstruction of the magazine.

Figure 2 is a top plan view of Figure 1and,

Figure 3 illustrates another form of means for effecting a release ofpressure between the logs as they approach the magazine.

Referring more particularly to the drawings, A indicates the grindstoneof any suitable grinder, B the magazine, C the grinding pocket and vDthe pressure shoe of the grinder.

As is usual, the logs are fed rfrom the magazine B to the grindingpocket C and in the type shown a shut oil door I is provided between themagazine and the grinder pocket which is operated through a suitablecylinder II., the piston rod I2 of its piston I3 being connected to thedoor so as to reciprocate it at the appropriate moment to allow a chargeto drop into the magazine and to prevent the next charge from entering.This control mechanism operates in conjunction with the controlapparatus I4 of the pressure shoe so that the operations synchronize.

Difficulty has been experienced, however, in the magazine in that thelogs tend to pack and jam tightly so that when the closure door I2 isopen to admit a charge to the pocket .D the logs often fail to drop orwill not drop immediately so that the smoot operation of the structureis seriously interfered with. To overcome this difficulty, I arrange toprovide for iiexibility in the wall construction of the magazine B sothat the pressure between the logs in the pocket is released as theyapproach the pocket and the logs are permitted to drop withoutobstruction into the grinding pocket. f

One form of practical construction is illustrated Vin VFigure 1consisting in a door or panel I5 adjacent to the grinding pocket whichis hinged as at IG so that it may, when released, swing outwardly thusrelieving any pressure between the logs and the magazine walls. Thisflexibility in the wall construction is only designed to be availableperiodically and in the form shown stop members II abut the panel ordoor I5 so that it is held rigid with the wall construction of themagazine. The stops Il are carried in suitable brackets I8 whichare'designed to operate with the shut off door I0, the brackets I8 beingconnected with the piston arrangement I3 so that when the door is openedthe stops are retracted from contact with the door as illustrated indotted lines in Figure l. Thus, exibility in the wall construction ofthe magazine is immediately available and the pressure between the logsis released but upon closure of the door I0 the wall structure is againheld rigid. The stop members as shown may be in the form of Yadjustablescrew threaded members.

It will be realized that this is only one practical means for providingflexibility in the wall construction and that other means are equallyapplicable. For instance, it is possible to provide a section of thegrinder wall or walls in the form of a panel -or section iexible initself with means for holding the whole panel or section rigid, that isby backing it with a rigid construction which may be removedperiodically to permit outward expansion or flexing of the wall orwalls. This form of construction and other lforms working on a similarprinciple will effect the desired result.

Another form of construction for relieving pressure between .the logs asthey approach the grinding pocket is illustrated in Figure 3. Thisconsists in tapering a wall or opposite walls of the magazine asindicated at I9 so that as the logs are dropped to the lower regions ofthe magazine the pressure which'ordinarily would arise is relieved andthe logs may be charged into the magazine Without this hindrance.

The invention isv particularly applicable to pocket grinders of the typeincluding a. shut olf door and in thatconstruction employing anarrangement for periodic flexibility in the walls rit is preferable toprovide for flexibility through an arrangement such as illustratedsynchronizing with the operation of the door operating means. Thelog-holding device of the type used for controlling the charge to thepocket referred to in a co-pending application Serial No. 678,- 295filed June 29th, 1933 may be used, this apparatus being illustrated inFigure 1 at E. However, where the grinder is of the single charge typeor tted with a holding device, in the constructions employing theprinciple of periodic ilexibility, the side or sides of the magazinemust be held to their inner rigid position while the single chargemagazine is being loaded or when the logs are being dropped in themultiple charge magazine. It will be noted that when ilexibility ispermitted the structure, in eiect, constitutes an arrangement having atapered formation, the wall or walls sloping outwardly adjacent to thepocket which provides a construction similar to that as initially builtinto a magazine of the type illustrated in Figure 3.

Various modifications may be made in the invention without departingfrom the spirit thereof or the scope of the claims and, therefore, theexact forms shown are to be taken as illustrative only and not in alimiting sense, and I desire that only such limitations shall be placedthereon as are imposed by the prior art or are specifically set forth inthe appended claims.

What I claim as my invention is:-

l. In a magazine grinder and in combination, a grinding pocket, amagazine positioned above the pocket. a shut 01T member operatingbetween the pocket and magazine, a door mounted on one side of themagazine, said door being swingable outwardly from the magazine and anadjustablestop member movable with the shut off member designed tocontact with the door when the shut off member is in its normal shut oirposition.

2. In a magazine grinder of the character described and in combination,a grinding pocket, a magazine from which wood is adapted to feed intothe pocket, means between the pocket and magazine for controlling thepassage of the wood from the magazine to the pocket and means on theside of the magazine cooperating with said control means for releasingthe pressure of the wood in the magazine when the wood is being passedto said pocket.

3. In a magazine grinder and in combination, a grinding pocket, agrindstone, means in the pocket for'feeding wood to the grindstone, amagazine extending upwardly from vthe pocket, means between the pocketand magazine for controlling the passage of wood from the magazine tothe pocket, means at the side of the lower end of the magazinecooperating with said control means for releasing the pressure of thewood in the magazine when the wood is being passed to said pocket.

4. In a magazine grinder and in combination, a grinding pocket, amagazine separate from the pocket from which wood is adapted to feedinto the pocket, means between the pocket and magazine for controllingthe passage of wood from the magazine to the pocket, an expansiblesection in the magazine adapted to permit the pressure of the woodtherein to be released, said expansible section being operable duringthe passage of wood to said pocket, and means cooperative with theexpansible section operable during certain periods of the operation forpreventing expansion of said section.

5. In a magazine grinder in combination with a grinding pocket, amagazine from which wood is adapted to feed into the pocket, a hingeddoor on the magazine adapted to permit release of the pressure of woodtherein during the passage of the wood to the pocket, means cooperativewith the door operable during certain periods of the operation forpreventing the opening of the door, and means between the pocket andmagazine for controlling the passage of the wood from the magazine tothe pocket.

6. In a magazine grinder of the character described and in combination,a grinding pocket, a magazine from which wood is adapted to feed intothe pocket, means between the pocket and magazine for controlling thepassage of wood from the magazine to the pocket, an expansible sectionin the magazine adapted to relieve the pressure of the wood thereinduring the passage of the wood to the pocket, and adjustable meanscooperative with the said expansible section for preventing expansion ofthe said expansible section during certain periods of the operation.

7. In a magazine grinder of the character de- I scribed and incombination, a grinding pocket, a magazine from which wood is adapted tofeed into the pocket having an expansible wall section by which thepressure may be released, during the passage of the wood to the pocket,and means between the pocket and magazine for controlling the passage ofthe wood from the magazine to the pocket.

8` In a magazine grinder and in combination, a grinding pocket, amagazine from which wood is adapted to be fed into the pocket having ahinged door to one side thereof adapted to be moved outwardly to releasethe pressure in the magazine during the feeding of the wood to thepocket, and means between the pocket and i magazine for controlling thepassage of the wood from the magazine to the pocket.

9. In a magazine grinder and in combination,

va grinding pocket, a magazine from which Wood is adapted to be fed intothe pocket having an expansible wall, and means associated with the Wallfor periodically controlling the expansion of the same.

10. In a magazine grinder and in combination, a grinding pocket, amagazine from which wood is adapted to be fed into the pocket having anexpansible wall, means associated with the wall for periodicallycontrolling the expansion of the same, means between the pocket andmagazine for controlling the passage of woodl from the magazine to thepocket and means for synchronizing the expansion of the magazine wallwith the operation of said last mentioned controlling means.

CHARLES ALEXANDER WATEROUS.

